Magneto



IJan, 13. 1925. 1,522,748

K Y A. RosNER KAGNETO Filed Dec. "7, 1921 INVENTOR ADOLPH ROSNER.

Q'LAQ@ ATTORNEY .Patented Jan..l3, 1925.A l

UNITED STA Tlezs` PATENT oFFlcE.

.ADOLPH 'ROSNER, O'F [SPRING-FIELD, MASSACHUSETTS, ASSIGNOR TO AMERICAN BOSCH MAGNETOI CORPORATION, OF'SPRINGFIELD, MASSACHUSETTS A CORPO-RA.-

TION OF NEW YORK.

MAGNETO.

Application filed; December 7, 1921. Serial No. 520,702.

To all 'whom it may concern.'

Be it known that I, ADOLPH RosNER, a citizen of the United States, residing at 4: Ventura Street, Springfield, in the county of Hampden, State of Massachusetts, have invented certain new and useful Improvements in Magnetos; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and'use the same. p

The present invention relates to magnetos ofthe oscillating type and more particularly toV the oscillating mechanism thereof.

It was customary, heretofore` to provide this type of magneto with a pair of helical springs which were fastened over rollers on the oscillating trip lever and over rollers on' studs extending laterally from the frame of the magneto. These springs extended outwardly a considerable'distance and require a good deal of space for installation. Moreover, it was diliicult to lubricate and protect the relatively movable parts thereof to elimnate excessive wear.A In some cases the helical springs were disposed co-axially of the oscillator shaft with the ends of the springs reacting Abetween a xed part of the magneto frame and the trip lever. In both types of construction, the springs had no support, but were held in position by their endsl only, through which the flexing stresses were effective.

In accordance with this part of my invention, the oscillating mechanism of the magneto has a spring which is disposed in a plane transverse to the axis of the oscillator and preferably in a plane parallel to the plane of oscillation of the trip lever. The spring also preferably surrounds the shaft of the oscillator.- The ends of the spring act in this plane and normally press against a fixed part'of the magneto. The triplever is operative, preferably owing to the lever extending between such ends of the spring, to press against either end of the spring to strain it in either direction of oscillation of the trip lever. A housing which is rigid with the frame of the magneto, by fastening it-to such frame, may also be pro-vided for the springs. Such housing is preferably made of pressed-up sheet metal, and has an annular channel in which the springs are located, the springs being -preferably p-rotectedby a cover plate. Such ousing may also have lubricating means for supplying a lubricant, by gravity, to the. springs, as well as to the bearing of the oscillator. A drain opening is also preferably provided in the housing for drainage ofthe excess lubricant. The spring may be arc-shaped7 but preferably, is substantially circular, and it may be formed from a plurality of superposed springs which are preferably arranged in a concentric relation. In order to support the springs and to distribute the actuating stresses thereto, the magneto is provided with an expansible member, preferably in the fo-rm of half rings-which are in mutual engagementl at one end thereof and normally contacting with a fixed part of the frame of the magneto at the other end thereof. These half r1ngs,the springs and the trip lever are so related that the lever is operative to move either of the half rings in either direction of oscillation of the lever to strain the springs. By such structure the oscillating mechanism. occupies less space and is 1n a more protected condition than inprior constructions; The spring also operates to more suddenly oscillate the oscillator, thus effecting a better sparking action, and it is more nearly dead beat or has a greater dampening effect on the oscillating parts than the springs of prior constructions. The half rings act to distribute the forces along the springs and also aid in effecting the dampening mentioned. Greater force may be im osed upon the springs without danger of reaking them.

In the accompanying drawing illustrating my invention in application, as an example, to a magneto of the oscillating type:

Fig. 1 is an end view of the magneto; Fig. 2 is a longitudinal sectional view through the oscillating mechanism and the end of the magneto; Fig. 3 is a similar view of a modified construction; Fig. 4 is 100 y end 5 of the frame 2 by means of screws 6, as is clearly shown in Fig. 2 ot the drawing. The outer end of the shaft has a tapered portion 7 to which is secured a trip lever 8 comprising a yoke portion 9 having a tapered bore to fit with the tapered portion 7 of the shaft. The trip lever 8 is held in position on the shaft by a. lock washer 10 and a nut 11 threaded upon the threaded end 12 of the shaft and is non-rotatably fastened to the shaft by means of a key 13. Between the oscillator and the shaft portion 3 is provided a collecting ring 14 with which may cooperate a collector brush, (not shown).

At the end of the frame is connected a pressed-up sheet metal housing 15, which is of annular shape, so las to provide an annular channel 16, within which is located a pair of half rings 17 and 18 and a group of springs 19, surrounding suchhalf rings. The housing 15 is secured to the frame 1 by screws 20, as is clearly shown i'n Fig. 4 of the drawing. The inner flanged portion 21 ot' the housing fits over a hub portion 22 forming an integral part of the frame 1, and the halt' rings 17 and 18 fit about the flanged portion 21. Thebearing 4 iits within this hub portion, as is clearly shown in Fig. 2 of the drawing.

At the top of the housing may be located an oil cup 23 from which a lubricant may be supplied by gravity to the ysprings 19 and the half rings 17 and 18, as well as to the bearing 4, the excess oil, flowing to the bottom of the housing, escaping. through a drain opening 24. For the purpose of sup'- plying oil to the bearing 4, the housing 15 is formed with an opening 25 for facilitating the passage of the oil to bores 26 and 27, respectively, provided in the hub portion 22 and the bearing 4, as is also clearly shown in Fig. 2 of the drawing.

The outer end of the housing is closed by a cover plate 28 which is secured 'by bolts 29 to the yoke portion 9 of the trip lever 8. At the lower end of the housing 15 and within the annular space 16 ,is located a block 30 which is held rigid with the outer flange 31 of the housing 15 by means of a hollow rivet 32, the passage through the rivet 32 forming the drain opening above mentioned. The half rings have downwardly extending ends 4and 34 located on the opposite sides of and normally in contact. with the block 30, the latter acting as a stop or abutment means for the ends 33 and 34. The other ends 35 and 36 of the half rings are in mutual contact at a point in ya vertical plane substantially coincident with the axis of the oscillator. The trip lever also Icarries an inwardly extending projection 37 located between the ends'33 and 34 of the half rings and above the stop block 30. The springs are substantially circular in form or arc-shaped, with their ends .and 18.

extending toward and capable of contactingbent to aid the sliding and the bending action ot' the s rings when strained during the operation o the magneto'. It will be noted that these springs are arranged in comentric relation and are of the same length and surround the half rings to normally hold the end portions 33 and 34 against the stop, block 30 and the upper ends 35 and 36 in mutual contact.

In operation, the trip lever is oscillated by a moving partiof an engine, so as to move the triplever in either direction of oscillation about the anis of the shaft of the oscillator. Depending upon the direction ot oscillation of the trip lever, the projection 37 engages with either the end 33 or 34, 'and causes either the half ring 17 or/.18 to move about the end 35 or 36 as :a 'ulcrum and to strain the springs 19. As the actuating member of the engine disengages 'from the lower end of the trip lever 8, the springs 19 suddenly react to return the half ring `17 or 18 to its normal position,` and to oscillate the trip lever together with the oscillator. Hence, the oscillator is given a sudden angular impulse during which the magnetic iux is reversed and aspark eiected at the interrupter contacts. During s uch reaction or contraction of the springs 19, the half ring 17 or 18 is brought to a stop against the stop block 30, and the trip lever impacts with the other end 34 or 33, as the case may be. Such impact is absorbed by the ends of the springs reacting against such end portions 34 or 33 of the halt rings, and the trip lever together with the oscillator, is quickly brought to normal position. It will thus be observed that the oscillating mechanism is double acting, capable ot' oscillating in either direction of oscillation, without making any cha-nge whatever in arrangement .of parts of construction.

In Fig. 3 of the drawing is shown a niodified construction in which the frame 1 has van integral extension 38 forming the housing for the springs 19 and the half rings 17 ln this construction the trip lever is riveted to the cover'plate 39 and the latter has at its lower end an inwardly extending projection 40, corresponding to the projection 37 of the trip lever shown in Fig. 2 of the drawing.' The housing 38 has an integral stop block 41 against which the ends 33 and 34 of the half rings come to rest, and

`the projection 40 extends between the ends 33 and 34, similar to the projection 37 of the trip lever 8 of the form shown in Figs. 3 and 4 of the drawing. A

1n Fig. 6 is shown a mode of selectively mounting the trip lever in one of several different positions. housing 15 is connected to the end of the t will be noted that thev frame l by four screws which are equally distant, such that the housing carrying the oscillatingV mechanism and the trip lever as a unit, may be turned in any one of four different positions, and connected in such position by screws 20. It will thus be observed that the trip level' may extend vertically downwardly or upwardly or laterally to the left or right, as 1s shownin the full and dotted line positions of the trip lever in Fig. 6 of the drawing.

In l-` ig. 5 the mechanismv is shown in strained condition, Where the trip lever has been moved to a point just prior to its release and reaction of the springs for oscillating the trip lever and oscillator.

Having thus described my invention, what l claim is:

l. A magneto comprising a frame, an osrillator, a generating Winding, an oscillatory trip lever fastened to said oscillator, and a plural-ity of superposed arc-shaped springs having the opposite ends of said springs normally pressing against a tixed part of said frame, saidl lever extending between said ends of said springs and being operative to press against either of said ends of said springs to strain said springs in either direction ot' oscillation of said lever.

2. A magneto comprising a frame, an oscillator, a generating winding, an oscillatory trip lever fastened to said oscillator a spring for oscillating said trip lever, an expandible member for straining said spring inveither direction of oscillation of said trip lever, said trip lever being operative to expand said member.

A magneto comprising a frame, an oscil-lator, a generating Winding, an oscillatory trip lever fastenedto said oscillator, a pair of movable strain members being in mutual engagement at one end oli-said members and normally in contact with a xed part of said frame at the other end of said members, a spring normally holding said members in contacting position, said tri lever being operative to move either of sai members in either direction of oscillation of said trip lever to strain said springs. Y

4. A magneto comprising a frame, an oscillator, a generating Winding, an oscillatory trip lever fastened to said oscillator, a pair of half rings being in mutual engagement at one end of said rings and normally 1n contact with a fixed part of said vframe at the other end of said rings, a spring normally holding said half rings in contacting position, said trip lever being operative to move veither of said half rings in either direction of oscillation of said trip lever to strain said springs.

In' testimony whereof I aiiix my signature.

ADOLPH ROSNER. 

